I'd like to be able to save IMAP attachments. Currently V8 only allows attachments to be opened but your code can't seem to figure out what application to use (simple things like .doxc, .pptx, etc) - making your IMAP functionality difficult to use.

this is definitely a bug. The attachments were downloaded without the proper file name and extension, which is preventing Windows to find the correct program to open them.The issue will be fixed in 8.5 and also a saving attachments functionality may be added.